First, this issue isn't cause by Galacticraft (maybe
)
Jordsta95 -
This does not mean that Galacticraft caused the crash. All that's happening here is that if Galacticraft is installed, the regular Minecraft player class
EntityPlayerMPnow has
GCEntityPlayerMP in its place. This does not cause crashes. Think of it as just a name change on the vanilla class
EntityPlayerMP. The crash report is simply reporting the players who are online or nearby to the chunk which is crashing, in exactly the same way that a Minecraft crash report always does. If Galacticraft is installed, all the players will be GCEntityPlayerMP. That's all.
Some crash reports do of course actually involve the player - for example if the player took damage from a mob, or a potion effect added by a mob is crashing, or something like that. Again, just because GCEntityPlayerMP is named here (or GCEntityClientPlayerMP, on a client) does not mean Galacticraft is causing the crash.
Galacticraft is actually pretty stable nowadays.
This entity... Is a mob you might have met when you joined the world, or something like that... It may possibly crashing your world... That's all I know...